No. Different combined-machine designs manage condensed moisture differently, and some discharge through the drainage connection instead of an ordinary removable dryer tank.
Understanding this situation
A missing tank is not evidence that a component has been left out. Likewise, a tank-cleaning instruction for a separate dryer may not apply to a washer-dryer that uses another system.
A useful next step
Identify the exact appliance type and consult its maintenance diagram. Only empty or clean parts described as owner accessible for that model. If drying or drainage changes, report the actual symptoms rather than searching behind panels for a presumed reservoir.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.